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In 2017, a predicted thumping win for Theresa May never materialised as Labour out-performed the expectations of pollsters and left the government in hung Parliament territory.

That means that no party wins a majority of seats in Parliament - 326.

The Tories had to draw on the backing of the Democratic Unionist Party to help vote its policies through, but after hardline Tories voted against Mrs May and later, Boris Johnson removed the whip from 21 of his own MPs, no Brexit deal has been able to pass through Parliament.

That led to this election.

There was another hung Parliament in 2010 - which ended in the five-year Conservative/Lib Dem coalition which saw Nick Clegg's party break its election pledge to scrap university tuition fees, and instead triple them.

General Election 2019

But if there's no majority tonight - what might happen?

If, as is hugely likely, the Conservatives are the largest party in the House of Commons, Boris Johnson has a few options.

He could try and negotiate with another party to form a coalition - although he has used this election campaign to consistently warn of a coalition between Labour and the Scottish National Party.

He could even attempt to govern with a minority in the Commons, but that would bring us back to the situation we had just months ago, when a number of his attempts to pass bills through Parliament were blocked as there were not enough Tory MPs to vote for them.

Another option is for him to resign and to ask the leader of the opposition, Jeremy Corbyn, to form a Government.

It's unlikely the Labour leader would have enough MPs to govern, so he would have to approach the leaders of other parties to take up that option.